Years after the battle
against Orochi, the Serpent King, the heroes of the Three Kingdoms
and the Warring States struggle to seize control of the new universe
they were thrown into when a new threat arises. A terrible and colossal
monster, resembling a serpent with eight heads, casts its shadow
across the land and defeats most of the brave warriors.

The ones that survived, assisted by the mysterious Kaguya, travel
back through time to save fallen warriors and forge new alliances,
collect powerful weapons and build an army so they can have a
chance to defeat the terrible Hydra.